new keybinding for jump in mythmusic

Description

Because seeking in mythmusic is cumbersome if you have longer dj-mixes and can only go forward/back for five seconds, i have made this patch against rev. 23546. With this it's possible to jump forward/back for 60 seconds every keypress. There is a new keybinding like in video playback (JUMPFFWD,JUMPRWND).
Don't know it it is a dirty hack, but it would be nice if this would be incorporated in mythtv.

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